Analysis & Transposing
Key Finder
Enter the chords from a song to estimate likely keys and see match strength. A practical starting point for ear-copying and progression analysis.
Analysis & Transposing
Key Finder
Analysis & Transposing
Key Finder
Enter the chords from a song to estimate likely keys and see match strength. A practical starting point for ear-copying and progression analysis.
What is this tool?
A key detector that takes the chords in a song and figures out which key (major or minor) they most likely belong to. You'll see a match score and which diatonic chords each input chord corresponds to.
When it helps
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Confirm the key of a song you transcribed
Enter the chords you heard and instantly see whether the song sits in a major or minor key — and which one.
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Charts without a key signature
If a lead sheet or lyric site skips the key, this fills in the gap and links you straight to the diatonic chord table.
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Understand your own writing
Feed in a progression you're drafting to see what key it naturally implies — handy when you're between two tonalities.
How to use
- 1 Pick 'Text input' or 'Select input' in the top bar.
- 2 For text input, type chord names separated by spaces (e.g. C Am F G).
- 3 For select input, tap '+ Add' to choose a root and quality, then add it to the list.
- 4 Press 'Analyze' in the bottom dock; the most likely keys appear ranked by match score.
- 5 From each result card, jump into 'View diatonic' or 'View scale' to explore that key in depth.
Lessons that use this tool
The sections of the systematic curriculum where this actually comes up.
Learning courses that include this topic
Following the course in order gives you a structured foundation.